A020556 as tables, graphs or sounds

A020556 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`7`
`3`		`87`
`4`		`1657`
`5`		`43833`
`6`		`1515903`
`7`		`65766991`
`8`		`3473600465`
`9`		`218310229201`
`10`		`16035686850327`
`11`		`1356791248984295`
`12`		`130660110400259849`
`13`		`14177605780945123273`
`14`		`1718558016836289502159`
`15`		`230999008481288064430879`

[1,1,7,87,1657,43833,1515903,65766991,3473600465, 218310229201,16035686850327,1356791248984295, 130660110400259849,14177605780945123273, 1718558016836289502159,230999008481288064430879]

Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research